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US 12,164,982 B2Granted
Method for labelling products with an optical security feature with a temporal dimension
AssigneeFraunhofer-Gesellschaft zur Förderung der angewandten Forschung e. V.
InventorsTobias Jochum, Jan Niehaus
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Abstract
The present invention is based on a method for marking products using two or more ink formulations, each containing one or more photoluminescent dyes emitting radiation in the range of 380-3000 nm under photon excitation and distinguished by different fluorescence lifetimes, for storing information in serialization and/or track & trace systems and for document security.
Claims20
A method of labeling products comprising:
- providing two or more ink formulations, each containing one or more photoluminescent dyes, that emit radiation in the range of 380-3000 nm under photon excitation, wherein the ink formulations differ by different photoluminescence lifetimes of the photoluminescent dyes;
- generating a multi-dimensional code for identifying a product, wherein at least one dimension is a spatial dimension and one dimension is a temporal dimension, based on the photoluminescence lifetimes of the photoluminescent dyes;
- printing the ink formulations on at least one area of the surface of the product in the form of said multi-dimensional code;
- irradiating the product printed with the ink formulation with photons;
- detecting the radiation emitted by the irradiated product in the range from 380 to 3000 nm, as well as the time course of this radiation over a period of time from 1 ns to 1 min.
2 more elements
Dependencies are inferred from the claim text.